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The rotating spray head has several different patterns and they are all useful.
I use the shower setting most often to gently place the stream at the base of the plants. Keeping it off the leaves helps prevent powdery mildew in certain species.
The length lets me reach over, up and down, without bending or stretching.
The slider on the handle keeps the unit on without having to constantly squeeze a trigger, so I can focus on tending the garden.
It also lets me easily choose a smaller or larger flow rate. This feature prevents my hand and wrist from getting so tired.